@inproceedings{WLC-2000-Machida,
	author        = "Hajime Machida",
	booktitle     = "{Proceedings of the Third International Colloquium on Words, Languages & Combinatorics}",
	isbn          = "978-9810249489",
	pages         = "286--296",
	publisher     = "{World Scientific}",
	title         = "{Some Properties of Hyperoperations and Hyperclones}",
	year          = 2000,
}